Strike-plate for locks.



PATEN'II'ED JULY 21, 1908.

Jmrentor Attorne s I A. NATHAN. STRIKE PLATE FOR LOCKS.

APPLICATION FILED JUNE 20. 1907.

I I I I I l v l{ H GIK] . Witnesses I Arthur Nathan *6 n ARTHUR NATHAN,OF GHARLOTTENBURG, GERMANY.

STRIKE-PLATE FOR LOCKS.

Specification of Letters Patent.

Patented July 21,1908.

Application filed June 20, 1907. Serial No. 379,927.

To all whom it may concern:

Be it known that I, ARTHUR NATHAN, engineer, citizen of Germany, subjectof the King of Prussia and Emperor of Germany, residing at 87Goethestrasse, Charlottenburg, near Berlin, in the Kingdom of Prussiaand Empire of Germany, have invented new and useful Improvements inStrike- Plates for Locks, of which the following is a specification.

The present invention relates to an improved strike plate especiallyadapted for use with locks of the kind described in my U. S. Patentapplication Serial Number 249496 and in which the bolt must first comeinto locking position. In such looks it is noticed that the latch andbolt remain in half locking position, when the door is closed with thehandle; for in such instance the bolt is caught by the latch in halflocking position when the handle is released. This disadvantage isentirely remedied by the use of this improved striking plate. Itconsists of a special part movably attached to the striking plate whichon closing the door will prevent the latch from entering the strikingplate or retain the latch in open position, in which it leaves the boltfree, until the bolt has entered into the strikin plate and turns orpushes aside the movabIe part retaining the latch.

In the accompanying drawing such an arrangement is exemplified and exlained, Figures 1 and 2 showing the device tted to the back of thestriking plate in two different positions, Figs. 3 and 4 showing themain part of the invention detached in front and side elevation resectively Figs. 5, 6, 7 and 8 show details of t e design.

The principal part of the device is thelever A separately shown in Figs.3 and 4. This lever is pivoted on the back of the striking plate B onpin d (Figs. 5 and 6). The art a of this lever A (Figs. 1 and 2)projects mto a small frame I) likewise fitted to the back of thestriking plate B. This frame serves as a guide and stop for the lever Aon the sides 0 (Figs. 1 and 2). The pin (1 has on its square part 6(Figs. 5 and 6) a spring m of the known ind (Figs. 1 and 2). This s ringpresses against lug 1 of the lever. On its lower part the latter has abevel 8 (Figs. 3 and 4).

The operation in using the device is as follows: When the door isopened, the latch and bolt of the lock are both not in looking posi tionor project only with their bevel, the lever on the striking plate beingunder action of the spring m in the position shown in Fig.

1. When the door is closed, the latch and bolt will advance up tothesharp edges 76 (Figs. 1 and 2) of the striking plate. Now the boltshould first slide forward and this is obtained by the latch beingretained by its striking against part f ofthe lever A, while the boltstrikin with its bevel against the bevel 7c of the lever, passes thesame and thereby moves it around its pivot. As soon as the bolt hasadvanced far enough the lever reaches the position shown in Fig. 2 andnow also the latch can advance. If this process is observed on a lock ofthe kind described in the U. S. Patent application Serial No. 249496,say the type for doors of rail road carriages during the locking rocess,it can be noticed that the lock is he (1 open by the lug restin againsttooth. The look therefore had t e disadvantage when an ordinary strikinglate was used, that latch 1 and bolt 10 woul advance only for a littledistance when the handle connected with the o erat ing lever was used toclose the door. y the new arrangement this disadvantage is removed, byboth when the door is slammed shut or closed by the handle the latch 1is retained by part f of the lever A, when the door closes into theframe, so that the bolt must advance first and tooth of the bolt willpass above the lug of the latch, whereby bolt and latch may come in fulllocking position.

Now the dimensions have been so chosen, that at any stroke of the handleand if the door is closed into the frame, the locking device must alwayscome into locking position, as in the moment where the tooth of the boltis going to lie before lug of the latch, the latter is retained by thelever and the tooth passes the lug. If on the other hand in opening thelock the stroke is too short, so that the lever A could not yet comeinto action, latch and bolt cannot remain idle as the lug is gliding onthe tooth but both again enter full locking position. Instead of a leverpivotally connected with the striking plate a slide may be usedrectilinearly displaceable on the striking plate.

Having now described my invention what I claim and desire to secure byLetters Patent of the United States is:

1. In a lock provided with an automatically closing bolt, thecombination of means removably arranged on the striking plate forretaining the latch in unlatched position, one

portion of said means lying in the direction of the latch opening of thestriking plate, the other portion of said means lying behind the boltopening, said first mentioned portion being pushed out of the range ofthe latch by the advancing bolt engaging said second mentioned portion.

2. In a lock provided with an automatically closing bolt, thecombination of a slide attached to the striking plate, one end of saidslide lying behind the latch opening of the striking plate for retainingthe latch in unlatched position, and the other end of the slide lyingbehind the bolt opening.

3. In a lock with an automatically closing bolt the combination of alever pivoted to the rear of the striking plate, means for guiding saidlever, stops for limiting the stroke-of said lever, a spring inconnection with said lever, said spring returning said lever into itsnormal position when the bolt and latch are withdrawn, substantially asdescribed. W 4. A striking plate for a lock provided with anautomatically closing bolt, having movable means mounted thereon forretaining the latch in unlatched position, said movable means beingarranged to be pushed out of the range of the latch by the advancingbolt.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

ARTHUR NATHAN. Witnesses:

HENRY HAsPER, WOLDEMAR I-IAUPT.

